Detail of "56-03-1"

Reference

Protonation processes of unusual exothermicity

Protonation processes of unusual exothermicity. Fabbrizzi, L.; Micheloni, M.; Paoletti, P.; Schwarzenbach, G. (Ist. Chim. Gen. Inorg., CNR, Florence, Italy). J. Am. Chem. Soc., 99(17), 5574-6 (English) 1977. CODEN: JACSAT. DOCUMENT TYPE: Journal CA Section: 69 (Thermodynamics, Thermochemistry, and Thermal Properties) The protonation of guanidine [113-00-8] and biguanide [56-03-1] is more exothermic by 25 and 70%, resp., than the neutralization of OH-, the strongest base in aq. soln. The effect is caused by the symmetrization of the mesomeric mols. during the process (resonance energy). The protonated base mols. are also more rigid, which shows up in unually low and even neg. entropy changes.

Purification of water

Purification of water. Hemming, Malcolm Lisle; Smith, Malcolm Robert; Singer, Michael (Imperial Chemical Industries Ltd., Engl.). Ger. Offen. DE 2704334 25 Aug 1977, 14 pp. Addn. to Ger. Offen. 2,522,792. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C02B001-20. PRIORITY: GB 76-4409 4 Feb 1976. DOCUMENT TYPE: Patent CA Section: 61 (Water) A polymeric biguanide [56-03-1], e.g. poly(hexamethylenebiguanide), under the tradename Vantocil IB [32289-58-0] is recommended as a flocculating agent for clarifying waters of suspended solids.